Significant performance improvement in terms of reduced cathode flooding in polymer electrolyte fuel cell using a stainless-steel microcoil gas flow field

• Published in: Journal of power sources 2014, Vol.248, p.524-532
• Main Authors: TANAKA, Shiro, SHUDO, Toshio
• Format: Article
• Language: English
• Subjects: Applied sciences; Cathodes; Channels; Density; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrolytes; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Flooding; Fuel cells; Gas diffusion; Gas flow; Materials
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2013.09.119

Flooding at the cathode is the greatest barrier to increasing the power density of polymer electrolyte fuel cells (PEFCs) and using them at high current densities. Previous studies have shown that flooding is caused by water accumulation in the gas diffusion layer, but only a few researchers have succeeded in overcoming this issue. In the present study, microcoils are used as the gas flow channel as well as the gas diffuser directly on the microporous layer (MPL), without using a conventional carbon-fiber gas diffusion layer (GDL). to enable flood-free performance. The current-voltage curves show flooding-free performance even under low air stoichiometry. However, the high-frequency resistance (HFR) in this case is slightly higher than that in grooved flow channels and GDLs. This is due to the differences in the electron conduction path, and the in-plane electron conductivity in the MPL is the key to enhancing the microcoil fuel cell performance.